FILE - In this Aug. 22, 2012 file photo, President Barack Obama speaks during a campaign stop in North Las Vegas, Nev. Barack Obama needs to remind voters why they loved him in 2008. Mitt Romney needs for voters to get to know and like him better And both must strike a balance with their conventions to fire up core backers without alienating undecided voters who may well decide a close election. (AP Photo/Isaac Brekken, File)

Associated Press
FILE - In this Aug. 22, 2012 file photo, President Barack Obama speaks during a campaign stop in North Las Vegas, Nev. Barack Obama needs to remind voters why they loved him in 2008. Mitt Romney needs for voters to get to know and like him better And both must strike a balance with their conventions to fire up core backers without alienating undecided voters who may well decide a close election.  (AP Photo/Isaac Brekken, File)
FILE - In this Aug. 22, 2012 file photo, President Barack Obama speaks during a campaign stop in North Las Vegas, Nev. Barack Obama needs to remind voters why they loved him in 2008. Mitt Romney needs for voters to get to know and like him better And both must strike a balance with their conventions to fire up core backers without alienating undecided voters who may well decide a close election. (AP Photo/Isaac Brekken, File)
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